A320977 - cp's OEIS frontend

A320977 Number of permutations p of [n] such that the up-down signature of p has nonnegative partial sums with a maximal value of three.

n	a(n)
3	0
4	1
5	4
6	57
7	311
8	3857
9	27589
10	355751
11	3185258
12	44435241
13	479927081
14	7311147055
15	92603527295
16	1540826943617
17	22398016781688
18	405865410503155
19	6658173453910401
20	130871330990044897
21	2390845313044048301
22	50759828657781860167
23	1021623022236754343662

[0, 1, 4, 57, 311, 3857, 27589, 355751, 3185258, 44435241, 479927081, 7311147055, 92603527295, 1540826943617, 22398016781688, 405865410503155, 6658173453910401, 130871330990044897, 2390845313044048301, 50759828657781860167, 1021623022236754343662]

cp's OEIS Frontend

A320977 Number of permutations p of [n] such that the up-down signature of p has nonnegative partial sums with a maximal value of three.

Table of values

List of values